SUBJECT INDEX. 



ABIOGENESIS, 19 



Acid, acetic, production of, by bacteria, 



85, 411, 412 

 butyric, production of, by bacteria, 



86 



carbonic, influence on calcium car- 

 bonate, 172 



citric, production of, by mold, 87 

 formic, produced by bacteria, 85, 87 

 gluconic, from dextrose, 86 

 hippuric, action of bacteria on, 92 

 lactic, mechanism of formation, 86 



production of, by bacteria, 85 

 oxalic, produced by molds, 87 

 phosphates, action on calcium car- 

 bonate, 172 



propionic, from propyl alcohol, 86, 87 

 sulphuric, produced by sulphur bac- 

 teria, 179 



uric, action of bacteria on, 91 

 valeric, produced by molds, 87 

 Acid-forming bacteria in milk, 376 

 Acids, amino-, from proteins, 86 

 influence on denitrification, 241 



on potassium of soil, 180 

 produced by Azotobacter, 269 

 by bacteria, 84 



in soil, 172 



in cellulose fermentation, 328, 330 

 in milk, 376 



by nitrifying organisms, 176, 178 

 Actinomyces in soil, 169 

 Aeration, influence on ammonia pro- 

 duction, 202, 203 

 on Azotobacter, 281 

 on denitrification, 242, 246 

 on nitrification, 230 

 on number of bacteria in soil, 162 

 on Ps. radicicola, 312 

 on toxicity of arsenic in soil, 124 

 Aerobacter, 251 

 Aerobes, 69, 109 

 Air, bacteria in, 336, 339 



inspired and expired, 339 

 factors governing number and kind 



of bacteria in, 336, 337, 338 

 how bacteria enter, 336 

 Air-borne infection, 339 

 Alcohol as disinfectant, 111, 112 



Alcoholic fermentation, 83, 411 



reactions of, 83, 84 

 Algae, blue-green, 30, 31 



relationship to Azotobacter, 274 

 Alinit, 250, 251, 285 

 Alkali, influence on nitrification, 220 

 Amaneta muscaria poisoning, 396 

 Amidases, production of ammonia by, 



206 



Amino-acids, alcohol from, 84 

 ammonification of, 206 

 in Azotobacter, 268 

 formation of, by Azotobacter, 270 

 in legume nodules, 309, 310 

 Amins, formation of, by bacteria, 90 

 Ammonification, 27, 34, 92, 194-207 

 by actinomyces, 170 

 chemistry of process, 204-207 

 fungi-producing, 17 

 influence of aeration on, 202, 203 

 of antiseptics on, 130, 135 

 of arsenic on, 119 

 of calcium carbonate on, 139 



chloride on, 142 

 of carbohydrates on, 199 

 of climate on, 200 

 of crop on, 200 

 of green manure on, 156-159 

 of gypsum on, 142 

 of iron sulphate on, 142 

 of lime on, 141 



and magnesia on, 203 

 of manganese salts on, 143, 144 

 of manure on, 153, 154, 155, 159 

 oTmoisture on, 200, 201 

 of phosphorus on, 203, 204 

 of potassium salts on, 144, 145 

 of season on, 200 

 of sodium salts on, 145 

 of soil on, 200 

 of water on, 154, 155 

 methods of studying, 198 

 organisms concerned in, 194, 195 

 reactions, 192, 193 

 stimulation by salts, 147 

 toxicity of salts on, 149 

 variation with substrate, 199 

 Ammonifiers, distribution, 196, 197 

 Amygdalin, 80 

 Amylobacter, 328, 330, 332 

 Anabolism of Azotobacter, 269 



